Question

Which expression is equivalent to cos( pi/2+ r) for all values of r?
sin(r)
cos(r)
-sin(r)
-cos(r)

Answer 1

Answer:

C. -sin(r)

Step-by-step explanation:

I did the test on edge

Answer 2

The expression which is equivalent to cos (π/2 + r) for all values of r is -sin r.

What is Quadrant?

In the cartesian system, a plane is divided into four regions by a horizontal line called X-axis and a vertical line called Y-axis. These four regions are known as quadrants.

Here, given expression;

        cos (π/2 + r)

We know that,

Angle (π/2 + r) lies in second quadrant

In second quadrant, only sin and cosec will be positive, rest all will be negative.

Now,

cos (π/2 + r) = - sin r

Thus, the expression which is equivalent to cos (π/2 + r) for all values of r is -sin r.

Learn more about Quadrant from:

https://brainly.com/question/7196312

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